The adventure story revolves around Hiro, a 14-year-old boy who lost his dear brother Tadashi in a mysterious accident, and Baymax, a personal healthcare companion robot developed by Tadashi. The story is set in San Fransokyo, a fictional city that combines the imagery of San Francisco and Tokyo.

(Source: Anime News Network)

A story about two brothers and a robot, Baymax.
 
Set in a fictional metropolis called San Fransokyo (a portmanteau of San Francisco and Tokyo), a young robotics prodigy named Hiro Hamada and his robot Baymax uncover a criminal plot and pull together a team of inexperienced crime-fighters, including Wasabi, Honey Lemon, GoGo Tomago, and Fred to solve the mystery surrounding the crime.
 
Note: The chapter count includes the prologue.

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